Wood board energy-saving drying device

Abstract

The utility model discloses an energy-saving drying device for wood plates, which belongs to the technical field of wood drying, and is characterized by comprising a preheating furnace and a heating furnace which are communicated with each other, the heating furnace is provided with an air supply outlet communicated with a drying chamber, and the preheating furnace is provided with a waste gas inlet for waste gas in the drying chamber to enter the preheating furnace; the fresh air inlet is used for allowing external air to enter the preheating furnace; the convection heat exchanger is used for carrying out heat exchange on waste gas and air; waste heat of waste gas is transmitted to air through the convection heat exchanger, and then the waste gas is discharged from the waste gas outlet; the air feeder is used for feeding air absorbing the waste heat of the waste gas into the heating furnace; the waste heat recovery device has the advantages that waste heat of waste gas is transmitted to cold air, so that the heater can more easily heat the air to the required temperature, the power of the heater is greatly reduced, energy is integrally saved, and the size of the heating furnace can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wood drying, and more specifically to an energy-saving drying device for wood boards. Background Art

[0002] At present, wood drying is done by introducing ambient air from the outside, heating it up through a heater and then transporting it into a drying room to dry the wood. The exhaust gas after drying is directly discharged, and a large amount of waste heat remains in the exhaust gas. The energy utilization rate is low, the loss is large, and there is still room for improvement. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of the present utility model is to provide an energy-saving drying device for wood boards, which has the advantage that by transferring the waste heat of the exhaust gas to the cold air, it is easier for the heater to heat the air to the required temperature, greatly reducing the power of the heater, thereby saving energy as a whole and reducing the size of the heating furnace.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A wood board energy-saving drying device comprises a preheating furnace and a heating furnace which are connected to each other, the heating furnace is provided with an air supply port connected to a drying chamber, and the preheating furnace is provided with:

[0006] The exhaust gas inlet is used to supply the exhaust gas in the drying chamber to the preheating furnace;

[0007] Fresh air inlet, used to supply outside air into the preheating furnace;

[0008] A countercurrent heat exchanger for exchanging heat between exhaust gas and air;

[0009] An exhaust gas outlet, where the exhaust gas passes through the countercurrent heat exchanger to transfer the residual heat to the air and then is discharged from the exhaust gas outlet;

[0010] The blower blows the air after absorbing the waste heat of the exhaust gas into the heating furnace.

[0011] The utility model is further configured as follows: an air inlet box is arranged on the top of the preheating furnace, the air inlet box is communicated with the preheating furnace, and the fresh air inlet is opened on the top of the air inlet box.

[0012] The utility model is further configured as follows: a filter screen for filtering air is arranged at the connection between the air inlet box and the preheating furnace.

[0013] The utility model is further configured as follows: the countercurrent heat exchanger specifically adopts a hexagonal countercurrent heat exchanger.

[0014] The utility model is further configured as follows: a water collecting pan for collecting condensed water is arranged in the preheating furnace and below the convection heat exchanger.

[0015] The utility model is further configured as follows: temperature and humidity sensors are arranged at the exhaust gas inlet, the fresh air inlet, one side of the blower and the air outlet.

[0016] The utility model is further configured as follows: a heater is arranged in the heating furnace for heating the air in the heating furnace, and diffuser plates are arranged in the heating furnace and on both sides of the front and rear of the heater.

[0017] The utility model is further configured as follows: the diffuser plate comprises three diffuser sheets arranged in parallel.

[0018] Compared with the prior art, the utility model has at least the following advantages:

[0019] 1. After the exhaust gas in the drying room enters the preheating furnace, the waste heat is transferred to the cold air through the convection heat exchanger. The heater can more easily heat the air to the required temperature, greatly reducing the power of the heater and achieving high energy utilization. This saves energy overall and reduces the size of the heating furnace.

[0020] 2. By installing a filter at the connection between the air inlet box and the preheating furnace, the introduced air is filtered to prevent dust and debris from affecting the device.

[0021] 3. By setting diffusers on the front and rear sides of the heater, the air can pass through the heater more evenly, increasing the contact area with the heater and improving the heating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an overall schematic diagram of this embodiment;

[0023] Figure 2 It is the internal structure diagram of this embodiment.

[0024] Description of reference numerals:

[0025] 1. Preheating furnace; 2. Heating furnace; 3. Air supply port; 4. Exhaust gas inlet; 5. Fresh air inlet; 6. Convection heat exchanger; 7. Exhaust gas outlet; 8. Air blower; 9. Air inlet box; 10. Filter; 11. Water collecting tray; 12. Diffuser plate; 13. Partition; 14. Heater; 15. Base. DETAILED DESCRIPTION

[0026] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0027] A wood board energy-saving drying device, such as Figure 1 and Figure 2As shown, it includes a preheating furnace 1 and a heating furnace 2 which are interconnected. The preheating furnace 1 and the heating furnace 2 are fixed on the same base 15. A waste gas inlet 4 is provided on the top of the preheating furnace 1. The waste gas outlet of the wood drying chamber is connected to the waste gas inlet 4 through a pipeline, so that the used waste gas in the drying chamber is recovered into the preheating furnace 1.

[0028] An air inlet box 9 is provided on the top of the preheating furnace 1, and the bottom of the air inlet box 9 is connected to the preheating furnace 1. A fresh air inlet 5 is opened on the air inlet box 9, and the external cold air enters the preheating furnace 1 through the fresh air inlet 5. A filter 10 for filtering air is provided at the connection between the air inlet box 9 and the preheating furnace 1 to prevent dust and debris in the external air from entering the device.

[0029] A convection heat exchanger 6 is installed in the preheating furnace 1 for heat exchange between exhaust gas and air. The exhaust gas and air flow in a cross direction in the convection heat exchanger 6. The exhaust gas transfers the waste heat to the air, thereby increasing the air temperature. The heating furnace 2 can heat the air to the required temperature more easily. The exhaust gas and air enter from the front and rear sides of the convection heat exchanger 6 respectively. The left and right sides of the convection heat exchanger 6 are in contact with the inner wall of the preheating furnace 1 and are fixed to the inner wall of the preheating furnace 1 by screws. The convection heat exchanger 6 of this embodiment is specifically a hexagonal convection heat exchanger, which adopts the hexagonal heat exchanger of Xiamen Zhonghui Air Conditioning Co., Ltd.

[0030] An exhaust gas outlet 7 is provided on the side wall of the preheating furnace 1. The exhaust gas passes through the convection heat exchanger 6 to transfer the residual heat to the air and is discharged from the exhaust gas outlet 7. A water collecting pan 11 is provided in the preheating furnace 1 and below the convection heat exchanger 6 to collect condensed water generated in the preheating furnace 1.

[0031] A blower 8 is provided in the preheating furnace 1 and below the convection heat exchanger 6. The blower 8 is directly opposite to the connection port between the preheating furnace 1 and the heating furnace 2, and delivers the air after absorbing the waste heat of the exhaust gas into the heating furnace 2. A partition 13 is provided in the preheating furnace 1. After passing through the convection heat exchanger 6, the air is output to the independent cavity separated by the partition 13, ensuring that the blower 8 inhales the preheated air.

[0032] A heater 14 is installed in the heating furnace 2. The heater 14 is a plurality of heating tubes arranged vertically. Electric heating is used to heat the air in the heating furnace 2 to a required temperature. An air supply port 3 is provided on the side of the heating furnace 2 away from the preheating furnace 1. The air supply port 3 is connected to the drying chamber to transport the air heated to the required temperature into the drying chamber.

[0033] Diffuser plates 12 are provided in the heating furnace 2 and on the front and rear sides of the heater 14. The diffuser plates 12 specifically include three diffuser plates arranged in parallel. After the blower 8 blows air into the heating furnace 2, the air passes through the diffuser plates 12, so that the air passes through the heater 14 more evenly, thereby increasing the contact area with the heater 14 and improving the heating efficiency.

[0034] Temperature and humidity sensors are provided at the exhaust gas inlet 4, the fresh air inlet 5, one side of the blower 8 and the air outlet 3. The speed of the blower 8 and the power of the heater 14 are automatically controlled by PLC according to the temperature and dehumidification amount required for the drying target in different time periods.

[0035] The working process of the utility model is as follows: the exhaust gas in the drying room and the cold air from the outside are introduced into the preheating furnace 1 through the exhaust gas inlet 4 and the fresh air inlet 5 respectively, the exhaust gas and the air are in contact in the convection heat exchanger 6, so that the waste heat of the exhaust gas is transferred to the cold air, and the exhaust gas is discharged to the outside through the exhaust gas outlet 7, and the blower 8 sends the preheated air into the heating furnace 2, and the air is heated to the required temperature by the heating furnace 2 and then transported to the drying room, which greatly reduces the heating time and energy loss.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy-saving drying device for wood panels, Features: It includes a preheating furnace and a heating furnace which are interconnected. The heating furnace is provided with an air supply port which is connected with the drying chamber. The preheating furnace is provided with: The exhaust gas inlet is used to supply the exhaust gas in the drying chamber to the preheating furnace; Fresh air inlet, used to supply outside air into the preheating furnace; A countercurrent heat exchanger for exchanging heat between exhaust gas and air; An exhaust gas outlet, where the exhaust gas passes through the countercurrent heat exchanger to transfer the residual heat to the air and then is discharged from the exhaust gas outlet; A blower, which sends air that has absorbed the waste heat of the exhaust gas into the heating furnace; The top of the preheating furnace is provided with an air inlet box, the air inlet box is connected to the preheating furnace, and the fresh air inlet is opened at the top of the air inlet box; A water collecting pan for collecting condensed water is provided in the preheating furnace and below the convection heat exchanger; The heating furnace is provided with a heater for heating the air in the heating furnace, and the heating furnace is provided with diffuser plates at both the front and rear sides of the heater; The diffuser plate comprises three diffuser sheets arranged in parallel.

2. The energy-saving drying device for wood panels according to claim 1, Features: A filter screen for filtering air is provided at the connection between the air inlet box and the preheating furnace.

3. The energy-saving drying device for wood panels according to claim 1, Features: The countercurrent heat exchanger is specifically a hexagonal countercurrent heat exchanger.

4. The energy-saving drying device for wood panels according to claim 1, Features: Temperature and humidity sensors are arranged at the exhaust gas inlet, the fresh air inlet, one side of the blower and the air outlet.

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